2. 外语
  3. What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.

What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.

admin2005-01-30  81
问题 What is the main idea of the passage?
The passage suggests that oxygen remained in the atmosphere because ______.
选项 A、it was caused by outgassing
B、it was heavier than hydrogen
C、hydrogen became trapped in limestone
D、rays from the sun created equal amounts of hydrogen and oxygen ______.
答案B
解析
转载请注明原文地址:https://kaotiyun.com/show/RByO777K
0

托福（TOEFL）

相关试题推荐
随机试题
最新回复(0)